[E]ach and every citizen of this country has a right not only to follow his own beliefs but also has a right to change his beliefs....

A person's belief or religion is something very personal to him. The State has no right to ask a person to disclose what is his personal belief.... Any conversion, which take place by “force”, “fraud” or “inducement”, must be dealt with strictly in accordance with law which we have held to be valid. At the same time, the right to privacy and the right to change the belief of a citizen cannot be taken away under the specious plea that public order may be affected.